Epidemiology

Proteins involved in immunity, clotting and inflammation could help to unravel the complexity of long COVID

When symptoms start, COVID tests may say you’re not infected when you really are.

A new variant of the COVID-causing virus SARS-CoV-2 is behind the latest surge in infections this winter, but it doesn't appear to cause more severe disease

Several new studies reveal that getting multiple COVID vaccine doses provides strong protection against lingering symptoms

Here’s how to plan COVID-safer holiday get-togethers, using websites that show viral levels in wastewater

Separate outbreaks of pneumonia in children have cropped up in the U.S., China and Europe. Public health experts say the uptick in cases is not caused by a novel pathogen

The U.S.’s largest-ever outbreak of waterborne illness—cryptosporidiosis—hit Milwaukee 30 years ago. Why are many other water systems still vulnerable to the same parasite today?

Here’s why Long COVID may be declining and what we know about the trend so far

Environment and lifestyle changes have increased the prevalence of autoimmune diseases. If we want to address this epidemic, let’s start acting like it

A surge in respiratory disease in China appears to be caused by known pathogens, but the pattern of infections is still unusual

Too many people are suffering from long COVID and other postviral syndromes. Anthony Fauci says we need to step up funding and research now

A unique U.S. strain of leishmaniasis has just been reported